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A party spokesman said earlier: 'Ed and Justine are overjoyed at the birth
of their second child and can't wait to introduce the new arrival to
his big brother, Daniel.

'Both are keen to pass on their thanks to the NHS staff at the hospital.'

New arrival: Ed Miliband with partner Justine Thornton and their first son Daniel. They welcomed another son to their family last night

In September, Mr Miliband said that he would make sure his name was on the child's birth certificate this time around - after it was revealed he isn't legally registered as Daniel's father.

The 40-year-old MP for Doncaster North didn't accompany Justine to the council offices - and because he isn't married to her, couldn't be registered.

'I'm really embarrassed about this,' he said at the time.

'What happens is if you are partners, rather than married - as we found out after the event - is that when Justine went to register Daniel, she came back and said "You will never believe it, I can't register you. You have got to go along to the council offices and make sure you do it". I am really embarrassed I haven't.'

He added: 'We have got a second one on the way and I am going to make sure I do two for the price of one.'

They have six weeks to file documents relating to Samuel's arrival.

No name: Mr Miliband is missing from his son Daniel's birth certificate

Mr Miliband said he and Miss Thornton, 40, a Cambridge-educated barrister, will get around to tying the knot at some point - but that 'political events have got in the way'.

The couple met in 2004.

He said: 'I think marriage is a very important institution, but there are stable families that aren't married and stable families that are married.

'My love for Justine is profound and we're a very close unit.'

Oxford graduate Mr Miliband was elected as leader of the Labour Party in September after narrowly defeating his brother David.